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Home/ Questions/Q 811209
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Editorial Team
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Editorial Team
Asked: May 15, 20262026-05-15T01:00:30+00:00 2026-05-15T01:00:30+00:00

I would like to serve xbaps from the VS web dev server (cassini) to

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I would like to serve xbaps from the VS web dev server (cassini) to Firefox, but when served from the dev server, Firefox offers to download this file. As far as I can tell, this is because the dev server is serving the xbap file with a mime type of “application/octet-stream” instead of “application/x-ms-xbap”, which works when served from IIS.

Does anyone know how to change the mime type which the dev server uses for *.xbap files?

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  1. Editorial Team
    Editorial Team
    2026-05-15T01:00:30+00:00Added an answer on May 15, 2026 at 1:00 am

    you can’t. WevDev.WebHost is fairly clumsy when issuing content-types and has a very limited range of specific content-types.

    You can use CassiniDev. The latest release provides extended content-type support, including .xbap.

    see http://cassinidev.codeplex.com/SourceControl/changeset/view/49870#894160 for a complete list of supported types.

    Update: your problem may be that you installed FF after 3.5sp1 and do not have the NPWPF.dll in your FF plugins directory. Do you have this file?

    Update 2
    I have just released a version of CassiniDev that is a great drop in replacement for Visual Studio’s Development server. It’s enhancements include improved content-type support and integrated traffic logging/viewing.

    http://skysanders.net/subtext/archive/2010/05/22/release-cassinidev-for-visual-studio-2008-a-drop-in.aspx

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